Just a heads up, many Pioneer, Marantz, Carver, Sansui, Infinity and so on.
Scored an original Infinity IRS dealer brochure, super rare.
https://www.ebay.com/sch/amperexaudio/m.html?item=144312454675&hash=item2199b14e13%3Ag%3AW68AAOSwfophpm7V&rt=nc&_trksid=p2047675.l2562